In-situ observation of self-assembly of quasi-two-dimensional Au nano-submicron particles on β-SiC substrates via nanosecond-pulsed laser irradiation-induced dewetting of thin Au films

•Dewetting of Au thin film during laser irradiation was observed by in-situ HVEM.•The initial stages of Au-NPs array arrangements on β-SiC substrate were observed.•Long-range quasi-two-dimensional Au-NPs arrangements were found.•Our results provide direct evidence for the Rayleigh instability mechanism.•After laser irradiation, the broad photo absorption spectra was observed.

Herein is reported the dots alignment of Au nano-submicron particles (Au-NPs) on a chemical vapor-deposited β-SiC substrate through nanosecond-pulsed laser irradiation-induced dewetting of an Au thin film, which was successfully observed by in-situ high-voltage electron microscopy. The initial stages of the Au-NPs array arrangement were also successfully observed, and long-range quasi-two-dimensional Au-NPs arrangements were found after laser irradiation. Moreover, the effect of Rayleigh instability to form multiple Au-NPs in each line of the network structure after the hole growth in the Au thin film was confirmed.